package cn.trs.common.utils;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;

/**
 * @version 1.0
 * @author:TRS
 * @create:2023/3/29 17:23
 * @description:
 * @ClassName: ExcelMergedRegionUtil
 * @company TRS
 */
public class ExcelMergedRegionUtil {

    private static ExcelMergedRegionUtil instance = null;

    /**
     * 单例模式获取实例
     * @return ExcelUtil对象
     */
    public static ExcelMergedRegionUtil getInstance(){
        if (instance == null)
            instance = new ExcelMergedRegionUtil();
        return instance;
    }

    /**
     * 获取合并单元格的值
     * @param sheet
     * @param row
     * @param column
     * @return
     */
    public String getMergedRegionValue(Sheet sheet ,int row , int column){
        int sheetMergeCount = sheet.getNumMergedRegions();

        for(int i = 0 ; i < sheetMergeCount ; i++){
            CellRangeAddress ca = sheet.getMergedRegion(i);
            int firstColumn = ca.getFirstColumn();
            int lastColumn = ca.getLastColumn();
            int firstRow = ca.getFirstRow();
            int lastRow = ca.getLastRow();

            if(row >= firstRow && row <= lastRow){
                if(column >= firstColumn && column <= lastColumn){
                    Row fRow = sheet.getRow(firstRow);
                    Cell fCell = fRow.getCell(firstColumn);
                    return getCellValue(fCell) ;
                }
            }
        }
        return null ;
    }

    /**
     * 获取单元格二维坐标，合并单元格和非合并单元格有区分
     * @param sheet
     * @param row
     * @param column
     * @return
     */
    public int[] getMergedLatitudeArray(Sheet sheet ,int row , int column){
        int sheetMergeCount = sheet.getNumMergedRegions();
        int[] latitude = {column,column,row,row,};
        for(int i = 0 ; i < sheetMergeCount ; i++){
            CellRangeAddress ca = sheet.getMergedRegion(i);
            int firstColumn = ca.getFirstColumn();
            int lastColumn = ca.getLastColumn();
            int firstRow = ca.getFirstRow();
            int lastRow = ca.getLastRow();
            if(row >= firstRow && row <= lastRow){
                if(column >= firstColumn && column <= lastColumn){
                    int[] mergedLatitude = {firstColumn,lastColumn,firstRow,lastRow};
                    return mergedLatitude ;
                }
            }
        }
        return latitude ;
    }

    /**
     * 判断合并了行
     * @param sheet
     * @param row
     * @param column
     * @return
     */
    public boolean isMergedRow(Sheet sheet,int row ,int column) {
        int sheetMergeCount = sheet.getNumMergedRegions();
        for (int i = 0; i < sheetMergeCount; i++) {
            CellRangeAddress range = sheet.getMergedRegion(i);
            int firstColumn = range.getFirstColumn();
            int lastColumn = range.getLastColumn();
            int firstRow = range.getFirstRow();
            int lastRow = range.getLastRow();
            if(row == firstRow && row == lastRow){
                if(column >= firstColumn && column <= lastColumn){
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * 判断指定的单元格是否是合并单元格
     * @param sheet
     * @param row 行下标
     * @param column 列下标
     * @return
     */
    public boolean isMergedRegion(Sheet sheet,int row ,int column) {
        int sheetMergeCount = sheet.getNumMergedRegions();
        for (int i = 0; i < sheetMergeCount; i++) {
            CellRangeAddress range = sheet.getMergedRegion(i);
            int firstColumn = range.getFirstColumn();
            int lastColumn = range.getLastColumn();
            int firstRow = range.getFirstRow();
            int lastRow = range.getLastRow();
            if(row >= firstRow && row <= lastRow){
                if(column >= firstColumn && column <= lastColumn){
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * 判断sheet页中是否含有合并单元格
     * @param sheet
     * @return
     */
    public boolean hasMerged(Sheet sheet) {
        return sheet.getNumMergedRegions() > 0;
    }

    /**
     * 合并单元格
     * @param sheet
     * @param firstRow 开始行
     * @param lastRow 结束行
     * @param firstCol 开始列
     * @param lastCol 结束列
     */
    public void mergeRegion(Sheet sheet, int firstRow, int lastRow, int firstCol, int lastCol) {
        sheet.addMergedRegion(new CellRangeAddress(firstRow, lastRow, firstCol, lastCol));
    }

    /**
     * 获取单元格的值
     * @param cell
     * @return
     */
    public String getCellValue(Cell cell){

        if(cell == null) {
            return "";
        }

        if(cell.getCellType().toString().equals("STRING")){

            return emoveSpecialChar(cell.getStringCellValue());

        }else if(cell.getCellType().toString().equals("BOOLEAN")){

            return emoveSpecialChar(String.valueOf(cell.getBooleanCellValue()));

        }else if(cell.getCellType().toString().equals("FORMULA")){

            return emoveSpecialChar(cell.getCellFormula()) ;

        }else if(cell.getCellType().toString().equals("NUMERIC")){

            return emoveSpecialChar(String.valueOf(cell.getNumericCellValue()));

        }
        return "";
    }

    /**
     *去掉特殊字符
     * @return
     * @throws Exception
     */
    public  String emoveSpecialChar(String value){
        String value1 = value.replace(" ", "");
        String value2 = value1.replace("&", "");
        String value3 = value2.replace("\\", "");
        String value4 = value3.replace("<", "");
        String value5 = value4.replace(">", "");
        String value6 = value5.replace("|", "");
        String value7 = value6.replace("\"", "");
        return value7;

    }
    /**
     * 从excel读取内容
     */
    public static void readContent(String fileName)  {
        boolean isE2007 = false;    //判断是否是excel2007格式
        if(fileName.endsWith("xlsx"))
            isE2007 = true;
        try {
            InputStream input = new FileInputStream(fileName);  //建立输入流
            Workbook wb  = null;
            //根据文件格式(2003或者2007)来初始化
            if(isE2007)
                wb = new XSSFWorkbook(input);
            else
                wb = new HSSFWorkbook(input);
            Sheet sheet = wb.getSheetAt(0);     //获得第一个表单
            Iterator<Row> rows = sheet.rowIterator(); //获得第一个表单的迭代器
            while (rows.hasNext()) {
                Row row = rows.next();  //获得行数据
                System.out.println("Row #" + row.getRowNum());  //获得行号从0开始
                Iterator<Cell> cells = row.cellIterator();    //获得第一行的迭代器
                while (cells.hasNext()) {
                    Cell cell = cells.next();
                    System.out.println("Cell #" + cell.getColumnIndex());
                    switch (cell.getCellType().toString()) {   //根据cell中的类型来输出数据
                        case "NUMERIC":
                            System.out.println(cell.getNumericCellValue());
                            break;
                        case "STRING":
                            System.out.println(cell.getStringCellValue());
                            break;
                        case "BOOLEAN":
                            System.out.println(cell.getBooleanCellValue());
                            break;
                        case "FORMULA":
                            System.out.println(cell.getCellFormula());
                            break;
                        default:
                            System.out.println("unsuported sell type======="+cell.getCellType());
                            break;
                    }
                }
            }
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }

}
